Eruptions of the Yellowstone volcanic system have included the two largest volcanic eruptions in North America in the past few million years; the third largest was at Long Valley in California and produced the Bishop ash bed.
On the diesel Passat, the TDI badge stands for Turbocharged Direct Injection, which isn't really all that helpful as the gasoline-powered Passat is also turbocharged and also uses direct injection. Volkswagen attempts to clear this up by calling this Passat the Passat TDI Clean Diesel.
Moreâ¦. At Audi, FSI stands for gasoline direct injection, a technology in which fuel is injected directly into the combustion chambers, rather than into the intake manifold in the traditional manner.More favorable in terms of thermodynamics, this method improves the efficiency of the engine.ike TDI engines, FSI and TFSI engines from Audi obtain fuel through a common rail injection system. In the gasoline engines, however, significantly lower injection pressures of about 150 bar (2,176 psi) are sufficient, owing to the lower compression ratios of these engines versus self-igniting diesel engines.